Swapped angles in Canny 3D edge detection in the ImageJ XLib plugin

[Smith, Benjamin E.]

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Hey Microscopists,

    I'm not sure who maintains the XLib plugin library for ImageJ, but I was using the Canny 3D edge detection plugin to get the 3D vector gradient of a stack.  In doing so, I found that the output windows labelled "theta" and "phi" are flipped, where the "theta" window shows the phi angles while the "phi" window shows the theta angles.  I confirmed this problem on a stack that is a pair of lines that were then Gaussian blurred.  Has anyone else noticed this problem?  Also, what would be a good way to let the people who maintain this plugin know?


Cheers,

   Ben Smith


Benjamin E. Smith, Ph.D.
Samuel Roberts Noble Microscopy Laboratory
Research Scientist, Confocal Facility Manager
University of Oklahoma
Norman, OK 73019
E-mail: [hidden email]
Voice   405-325-4328
FAX  [phone]
http://www.microscopy.ou.edu/

[Brian Northan]

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Hi Ben

There is a new ImageJ forum which is very active.  Posting there or on the
older imagej listserv would be your best shot at reaching the
maintainer(s).

ImageJ forum

http://forum.imagej.net/

ImageJ listserv

https://imagej.nih.gov/ij/list.html

On Fri, Apr 8, 2016 at 2:04 PM, Smith, Benjamin E. <[hidden email]>
wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Hey Microscopists,
>
>     I'm not sure who maintains the XLib plugin library for ImageJ, but I
> was using the Canny 3D edge detection plugin to get the 3D vector gradient
> of a stack.  In doing so, I found that the output windows labelled "theta"
> and "phi" are flipped, where the "theta" window shows the phi angles while
> the "phi" window shows the theta angles.  I confirmed this problem on a
> stack that is a pair of lines that were then Gaussian blurred.  Has anyone
> else noticed this problem?  Also, what would be a good way to let the
> people who maintain this plugin know?
>
>
> Cheers,
>
>    Ben Smith
>
>
> Benjamin E. Smith, Ph.D.
> Samuel Roberts Noble Microscopy Laboratory
> Research Scientist, Confocal Facility Manager
> University of Oklahoma
> Norman, OK 73019
> E-mail: [hidden email]
> Voice   405-325-4328
> FAX  [phone]
> http://www.microscopy.ou.edu/
>